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From: Junio C Hamano <>
To: "René Scharfe" <>
Cc: "Christian Göttsche" <>,
Subject: Re: [PATCH] setup: avoid unconditional open with write flags
Date: Wed, 07 Dec 2022 08:39:35 +0900	[thread overview]
Message-ID: <xmqqr0xc85l4.fsf@gitster.g> (raw)
In-Reply-To: <> ("René Scharfe"'s message of "Tue, 6 Dec 2022 20:47:09 +0100")

René Scharfe <> writes:

> Can opening /dev/null (or NUL on Windows) multiple times instead of dup'ing
> cause issues?  Can we e.g. lock ourselves out?

258e93a1 (daemon: if one of the standard fds is missing open it to
/dev/null, 2006-07-13) unfortunately does not explain why it was
done this way.

Given that "command </dev/null >/dev/null 2>/dev/null" should work fine,
I suspect that the "once we open a throw-away descriptor, instead of
opening the same file again, dup the fd and reuse" was done not for
correctness but for performance, under the assumption that open() is
more expensive?

      reply	other threads:[~2022-12-06 23:40 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-05 19:00 [PATCH] setup: avoid unconditional open with write flags Christian Göttsche
2022-12-05 22:13 ` brian m. carlson
2022-12-06  1:38   ` Jeff King
2022-12-06 16:15     ` Christian Göttsche
2022-12-05 22:59 ` Taylor Blau
2022-12-06  0:10   ` Junio C Hamano
2022-12-06  0:31     ` Taylor Blau
2022-12-06  0:40       ` Junio C Hamano
2022-12-06 19:47 ` René Scharfe
2022-12-06 23:39   ` Junio C Hamano [this message]

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